JPS60209743A - Picture forming apparatus - Google Patents

Abstract

PURPOSE:To enable positioning of an optical system unit for exposing a photosensitive body by effectively utilizing a fixing plate used for a drive system unit in a picture forming apparatus having a movable original placing platen. CONSTITUTION:The optical unit 4 is mounted between machine frames 6, while the protruding pin 52a of the unit 4 is engaged with the notch 6c of the frame 6. The pin 11b of the fixing plate 11 is inserted through the frame 6 into the pin hole 52b of the unit 4, and the protruding pin 52a is engaged with the notch 11a of the plate 11, then, the plate 11 of the drive system unit 2 is brought into substantial contact with the frame 6, and the unit 2 is fixed with a screw. Finally, the shaft 1a of the photosensitive body 1 is inserted through the round opening 6a of the frame 6 toward the side of the unit 2, and the shaft 1a is fitted to the fixing hole 13a formed in the main transmission shaft 13 to fix the body 1. As a result, the body 1 is connected with a main transmission gear 19 by the medium of the shaft 13 and fixed, and the optical system unit 4 is positioned with the fixing plate 11.

Description

[Detailed description of the invention] The uninvented invention relates to an image forming apparatus such as a copying machine, facsimile, printer, etc. using one person, especially movement +1
) The present invention relates to an image forming apparatus that operates on the order of tJ.

An image forming apparatus represented by the ladle mechanism 9
In the case of original ψ5, it is roughly divided into a method of moving the placing table and a method of moving the optical system. It is necessary to synchronize the moving speed of each moving body and the rotational speed of the photoconductor, and generally synchronization is achieved via a transmission mechanism that is connected between the drive system of the movable body and the drive system of the photoconductor. .

In the conventionally known image forming apparatus N, each of the drive systems and transmission mechanisms are individually mounted on the side wall surface of the copying machine main body, so that the drive system and the transmission mechanism are assembled into a set. In the method of assembling the parts individually, thread 11")
However, there were disadvantages such as difficulty in utilization, easy assembly, and unnecessary maintenance.

For this reason, conventionally it has been considered to integrate the drive system that drives the movable body and the photoreceptor all summer and form a unit, but in the conventional device, the diameter of the photoreceptor is 80 to 10 mm.
As a result, the distance between the axes of the moving body and the photoconductor becomes large, and as a result, the shape of the unit inevitably becomes large, and in order to obtain a predetermined rotational speed, the distance between the axes of the moving body and the photoreceptor increases. The diameter of the gear itself had to be increased, making it difficult to maintain the same viscosity for both sides, increasing the overall weight of the device, and significantly increasing costs, making it difficult to use Tenkawa.

It is an object of the present invention to provide an image forming apparatus that can overcome the drawbacks of the prior art.

The present invention provides an image forming apparatus having a movable original plate, and the drive described in 111 is performed by 'l) in which the distance between lj; An object of the present invention is to provide an image forming apparatus that enables unitization of the system.

Another object of the present invention is that even if the drive system is made into a unit, it is possible to maintain an appropriate distance between the points of the exposure lens interposed between the original plate 1n and the photoreceptor. The purpose is to provide an image forming device.

Furthermore, an object of the present invention is to provide a mechanism for use in the drive system unit.
- To provide an image forming apparatus that makes it possible to position the optical system unit for simply and easily exposing a photoreceptor by effectively utilizing 4Iy. By simplifying the process, it is possible to significantly reduce assembly man-hours, improve assembly accuracy, improve image quality, etc., and provide an image forming apparatus with extremely high practical value.

The present invention will be explained below based on the drawings.

1 and 2 show the main part configuration of a copying machine according to an embodiment of the present invention, si figure is a sectional view of the main part with a part of the structure of the drive system unit omitted, and FIG. 2 is i7', 1 This is a cross section 1 threshold taken along the line AA' in the figure.

l is a drum-shaped photoreceptor with a photoconductive layer formed on its surface, and its outer diameter R is smaller than conventional ones, 50φ or less, preferably 30φ.
The photoreceptor shaft 1 is set to protrude from the shaft center at both ends.
The leading end of the main shaft 13 is fitted into the mounting hole 13a of the main shaft 13 assembled into the drive system unit 2, which will be described later.

3 is the original 1ρ', H7z'i, mounting stand, which is made of a transparent glass plate, and has a slide rail 3b on the bottom surface of the 1 member 3a.
In addition to disposing a rack 3C, the document mounting table 3 is configured to be capable of reciprocating movement by forward and reverse rotation of a drive gear 14 pivotally supported by a handle [12 that constitutes the drive system unit 2].

Reference numeral 4 denotes an optical system unit, which includes a light source lamp 4b that illuminates the document surface via a reflection mirror 4a, and the light source lamp 4b.
An elongated rod-shaped self-on h lens 4 guides reflected light to the surface of the photoreceptor 1 and forms an electrostatic latent image corresponding to the original image.
C, and these are integrally assembled from the frame 5t. Further, the frame body 5 has a bottom plate 51 extending between the fuselage plates 6 disposed on both left and right sides;
A side JIM 52 is provided at the end of the photoconductor 11, and a +iii
Notch 11 formed in the mounting plate 11 of the acclimatization system unit 2
a and the protruding pin 52 at the position corresponding to the pin member 11b.
a and a bottle hole 52b are formed.

The body frame 6 is arranged at an angle of 11゛1 from the photoconductor axis 1a, and a circular space 1 through which the photoconductor axis 1afJ' can be inserted is formed on its wall surface.
In addition, a bottle hole 6b through which the pin member 11b of the receiving plate 11 can be inserted is formed on one side of the opening l'' portion 6a, and the optical hole 6b is formed on one end surface of the bottle hole 6bl. System unit 4 engages ii ■ Capable L; thank you note p” missing part 6
form C.

The pin hole 6b serves to fit the pin member 11b of the mounting plate 11 into the pin hole 52b of the optical system unit 4 without play.
However, the notch r%8C has a guiding function for engaging or inserting the protruding pin 52a of the optical system unit 4 into the notch 11a of the mounting plate 11. It may be formed into

The lIu moving yarn unit 2 has a pair of 1 (
(I + I' 41y 11, I2, and Iyll
, I was able to visit 1ill all together on 12th. It consists of a sliding system for driving the photoreceptors 1 and 111 (and the document mounting table 3) in rotation.

The main part of the present invention is F, which has the above-mentioned configuration.
A center and document mounting table 311i11Ilij, distance H 80
It can be configured to have a length of 130 mm or less, preferably 130 mm or less, which facilitates unitization of the drive system described later.

The detailed configuration of such a drive system unit 2 is shown in FIGS. J
This will be explained based on Figure '57.

Figures 3M to fi'7 show the configuration of each part of the +iQ drive system unit, Figure 3 is a plan view, and Figure 4 is B- of Figure 3.
8' line diagram, Figure 5 is a view from the back of Figure 2, and Figures 6 to 7 are schematic explanatory diagrams showing the forward movement and return of the manuscript table. be.

First, the mounting plate 11 constituting the drive system unit 2 will be explained with reference to FIG.

The handle 1 plate II located on the side of the fuselage frame L and e allows the photoconductor shaft 1a to be inserted into the position corresponding to the photoconductor I) 11
Carving t+ j:l! 11c is formed, a pin 1°1 piece material 11b that can be inserted into the bottle hole 52b of the optical system unit 4 is inserted into the opening 11c.
, 1 One end surface of 1 has an IJ notch 11 that engages with the protruding pin 52a of the optical system unit 4 (circular in the 1).
A is carved, and the optical system unit 4 is formed into a fixed position. Me, the mounting plate 11 has the circular opening 11c.
A 1fiL-shaped branch plate 11d is fixed on the back side of the branch Jlylld and other Jly
12 questions for A and J), fix the 4th axis 13. (See Figure 3) Note that 11e is for fixing the plurality of roots 11 to the fuselage frame 6! ! ? ! He is a child.

Next, the drive system will be explained according to FIGS. 3 and 4.

-) The 4-piece 13 extends one end into the space defined by the branching plate 11d and the holding plate II, and has the leading tooth 19 fixed on its end side, and the end surface axis 1 - is provided with a fixed and rotatable mounting hole 13a into which the photoreceptor shaft 1a is inserted.

The main gear 1 is located on the side of the +iii main gear 419.
The transmission gear 15 that matches 8 and 11 is also diagonal of the transmission 4 pawl 15! On the one hand, driven gears 16 are rotatably supported on the numeral plate 11 via support shafts 17 and 18, respectively. The driven gear 16 has a diagonal 1 and a circular side.
A pair of relay gears 20.21 having the same shape and mating with 6 and 11 are provided at symmetrical positions with respect to a rotating shaft 22.23.

The surface rotors 22 and 23 are connected via one-way clutches 24 and 25 interposed between the relay pawls 20 and 21 and the other mounting plates II and 12, respectively! 111 The one-way clutch 2 is rotatably supported between the two mounting plates 11 and 12.
4. Connect the other ends 22a and 23a of the rotating shaft on the 25 side to another mounting plate 1.
2 It protrudes outward.

In a normal state, the one-way clutch 24.25 is connected to the other end 22a of the rotating shaft even when the relay gear 20.21 rotates.

No rotational force is applied to the one-way clutch 23a, and a ring-shaped gear 28 is provided on the outer surface of the one-way clutch 24 and 25, respectively.
Lunch 29"1\i The rotational force of the gear rotates l
1111 to the other ends 22a and 23a, or the AN-configuration of the one-way Kura Sochi 24.25 is already known, so detailed explanation will be omitted.

On the other hand, on the side of the ring-shaped pawl 28.2!3, liA
The latch member 30 is opposed to the ring-shaped teeth 28 and 29.
．． 31 is attached via the support shaft 32.33 L Te installation 4Q11.12
It is attached to the rotation IIr.

U・Sojin,・“・+ and 30.31 months are both the above mentioned sub+
kl+ 32.33 above: ; installed spring 34.
35, when one force is applied to the bullet in the direction between the ring-shaped tooth Ij28.29 and q1 by 4=1, it becomes 11, IIV
The solenoid 36.37 which is connected to Jl and J12 latches each ring-shaped pawl 28.29 against the elastic force J; It is structured in a way that allows

To further explain the cat litter 4 of the Usochi member 30.31 in -T detail, the latch part J 30 has a substantially horizontal shape, and its) Iq rlR3C1a is arranged around the support shaft 32, The solenoid 3 extends in the direction 11 - the tip of 30b is attached to the side arm f4 through the link member 38 underwater, and extends and contracts in the direction
13a, the force is applied to the other arm portion 30 of the latch member 30.
d extends substantially horizontally along the lower space of the ring-shaped gear 28, and forms a claw portion 30c on the upper side of its tip, which fits into the ring-shaped gear 28 described in +iiij. Also, other side arm part 3
0d is further extended in the underwater direction, and its tip 30e is engaged with the branched arm portion 31d of the other latch member 31 facing IIf.
It is installed parallel to Noh.

Other latches:: The g member 31 has a substantially i1T shape, and when the AR31a is installed around the support shaft 33, it extends outward in the horizontal direction iFi. 1 is connected to the solenoid support 37a that expands and contracts in the vertical direction.Also, the other l1 extends from the base 31a described in +iii to 1.)J.
The 1I8 portion 31c is formed in an arc shape 14) on the ring-shaped pawl 29, and a pawl portion 31e that meshes with the ring-shaped gear 29 is formed on the tip side thereof. - The force test launch member 31 extends from the J and G portions 31a to a branch arm portion 31d extending horizontally along the lower space of the ring pawl 28,
The branch arm portion 31d is a launch portion, and the other arm portion 30d of the u30
The distal ends 30e and 1: of the latch member 30 extend oppositely to each other, and are arranged in parallel so as to be able to engage with the distal end 30e of the latch member 30 as described above.

In this way, the latch member 31 is connected to the one-way clutch 2.
The branch 1 die part 31 is located opposite the claw part 31e with the 5 in between.
d, and the tip of the branch arm 31d is attached to the latch member 30.
Tip 30e,! - Since the latch member 30 or 31 is arranged in parallel with the engagement OT function, when one of the latch members 30 or 31 rotates in the forward/backward direction due to the operation of the solenoids 3fla and 37a, the tip 30e or 31e or the other Tip 31e or 30
By pressing e, the other latch member 31 or 30 can be strongly rotated in the anti-latch direction.

Next, the structure of the other numeral board 12 on the back side is shown in FIG. 5 (described below).

The other end 22a of the rotating shaft has the one-way clutch 24, 25 interposed thereon as described above on the back side of the Jiri&12.

23a is provided in a protruding manner, and restraining iJU gears 26 and 27 that mesh with the other ends 22a and 23a by approximately 11 degrees are fixedly installed. The control gears 26 and 27 each have a gear ratio of 1:2, and the control gear 27 is connected to a control gear 28 fixed to the other end 22a, and the control gear 26 is connected to a control gear 28 for driving the original table. They are respectively meshed with Ijt14. Also, drive gear 14
teeth.

The gear 26 is located diagonally I; and is configured to be able to mesh with the rack 3c provided on the lower surface of the original table 3 by means of a gear 26 arranged so that the outer ring protrudes to one side from the mounting plate 12.・In addition, in the drive system unit 2 having such a configuration, the pressure #H between the photoreceptor axis la center and the original table 3 in 1iii is 80 mm or less by configuring the drive system in 1111 using each tooth 11L having a diameter to be described later. , preferably 80 mm or less, and according to this, the main gear l
The distance between the s-axis center and the rack engagement surface of the driving gear 14 can also be set to the same length H. Therefore, even if the diameter of each of the gears is made small enough to be easily machined, it is possible to obtain a desired rotational speed 1<().

That is, in this embodiment, the diameter of the main gear 18 is approximately 30φ.
, The diameter of the transmission gear 15 that meshes with the main gear 19 is approximately 20φ, the self-sweeping of the driven gear 16 that meshes with the transmission gear 15 is approximately 20φ, and the rotating shaft 22.2 that meshes with the driven gear 16.
The diameter of the pair of relay teeth *2o, 21 fixed to 3 is approximately 1
8φ, and the diameters of the control gears 26 and 27 fixed to the other end of the rotating shaft 22 and 23 via one-way clutches 24 and 25 are approximately 18 and 36φ, respectively, and the drive gear that meshes with the control gear 26. The diameter of 14 is set to approximately 3oφ.

In this way, the above 1 diq (fl+ if 18
Car center and drive gear14. It is possible to maintain the distance to one end at 80 mm or more, and it is possible to facilitate the threading of each of the gears and to reduce Krb+ of the drive system unit 2.

Next, the assembly procedure of each of the above devices is shown in Figure 1 to Figure 2 (74).
I explain.

First, the optical system unit 4 is installed between the body frames 1.6 while the projecting pin 52a of the optical system unit 4 is placed on the body frame 116 and engaged with the IJ notched corner 6c.

Next, insert the drive system unit 2 into the pin hole 52b of the optical system unit 4 through the frame 6 and insert the pin member 11b with the installation number I, and
1+JJl): After engaging the part 11a with the protruding pin 52a of the optical system unit 4, the drive system unit 2 is brought into contact with the fuselage frame 6 in a manner similar to that of the main body frame 6, and then screwed. Fix it by.

Finally, insert the photoconductor +14111a into the drive system unit 2 side through the circular opening 6a of the machine frame 6, and place the photoconductor 1.
= Attach the I hole 13a and the 1111 photoreceptor 1a in alignment.

As a result, the photoreceptor l and the main gear 18 are connected by +1 via the main shaft 13! At the same time, the optical system unit 4 is fixed by the mounting plate 11, and the distance between the document plate 1 and the photoreceptor axis is also adjusted so that the main axis is 13 degrees. Due to the narrowing of the shaft 17', the number 11 (-1 provisional 11 and -. Light '7, % The SELFOC lens 4c incorporated in the unit 4 is automatically placed at an appropriate position between the surface of the photoconductor 1 and the original table 3 at the photoconductor axis la center 1-. I can do it.

In addition, in the conventional assembly method of individually assembling the original plate 3, the optical system unit 4, and the optical element 1, the smaller the pressure MH between the surface of the photoreceptor 1 and the original plate 3, the more
It is extremely difficult to accurately position the focal point distance of the cell phone lens 4c, and a great deal of time is required for assembly; however, in this embodiment, as described above, the optical system unit 4, Since the photoconductor shaft 1a and the R member of the document placement table 3 are integrally regulated in position via the mounting plate 11 of the drive system unit 2, the surface of the photoconductor 1 of the SELFOC lens 4C or Ibu Hatake: The focal distance between the acupuncture tables 3 can be maintained at a constant distance without any errors in assembly. Becomes a cage-blind performer.

Next, the third section regarding the copying operation of the copying machine according to the embodiment.
6 and 714' (described below).

After placing the original on the original placing table 3'', when the copying switch is turned on, the solenoid 37 is activated and the one-way clutch 25 is launched via the launching member 31.
The relay gear 20 and the control gear 27 are connected via the rotating shaft 23 in which the one-way clutch 25 is interposed.

At the same time, due to rotation from an electric motor (not shown), +4 mountains +
When It19 rotates and the photoconductor l is rotated at a predetermined speed via the four main shafts 13 due to the rotation of the four main teeth jlf18)
(The pair of relay floats 20 and 21 are rotated via the transmission gear I5 and the driven gear 16.

The rotation of the pair of relay floats 20 and 21 causes the rotation shafts 22 and 23 to rotate, and as a result, since the one-way clutch 25 of the rotation shaft 23 is latched as described above, the relay gear 20 rotations are transmitted to control gear 27. On the other hand, since the one-way crank 24 installed on the other rotating shaft 22 is not latched, the other rotating shaft 22 idles, and the control gear 26 fixed to the other end 22a of the rotating shaft is free. The situation is as follows.

Therefore, the rotation of the control gear 27 is transmitted to the drive gear 14 via the control tooth 27 which is in a free state.

The drive gear 14 is rotated in the opposite direction. Then, by the reverse rotation of the drive gear 14, the original plate 3 is reversed to a predetermined position via the rack 3C. At this time, since the gear ratio of the aJI tooth type gear 27 is set to 1:2, the four originals 1 are reversed at twice the speed of normal rotation, which will be described later. (Refer to Figure A7) Next, the original plate 3
After the solenoid 37 is reversed to a predetermined position, a control mechanism (not shown) deactivates the solenoid 37 and activates the other solenoid 36, so that the launch member 31 is rotated.
The one-way clutch 2 is restored to its original state due to the force of the one-way clutch.
When the latch 5 is released, the latch member 3 on the other side
0 rotates and launches the one-way clutch 24 interposed on the other rotating shaft 22.

This connection connects the rotating shaft 22 via the one-way clutch 24.
A gear 20 fixedly installed at the riverside and a control gear 26 are connected to each other, and the rotation of the gear 20 is transmitted to the control gear 26 via the rotating shaft 22.
11 gear 14 rotates 11 times, +1X via rack 3C
The manuscript loading table 3 is moved and the copying process is started.

(See FIG. 6) On the other hand, since the one-way clutch 25 installed in the rotating shaft 23 is released, the control gear 27 fixed to the other end 23a of the rotating shaft is in a free state. +iii. Rotation of the control pawl 26 is not hindered.

Then, the +iii original document mounting table 3 moves forward to the predetermined position.
Return T4 of the original table 3 in the same manner as in No. 111,
’ starts, and one document is loaded at twice the speed of the 11th rotation.
returns to the specified position. (See Figure 7) Repeat this process.

As mentioned above, when one of the latch members 30 and 31 rotates in the latching direction due to the operation of the solenoids +1IIl+36a and 37a, even if the other latch member 31 is in the latch shape jA4
is maintained, the tip 30e or 31e presses the other tip 31e or 30e, and the other launch member 31 is configured to forcefully rotate 30 in the anti-latching direction. By rotating the latching member 30 or 31 in the latching direction, the front latches can be forcibly released.

Therefore, if the elastic force of the spring 34.35 that applies elastic force to the latch member 30.31 weakens, even if the solenoid 38.37 is erroneously activated, the Only one of the members 30 and 31 is latched, and both of the one-way clutches 24. , 25 will not be accidentally tampered with, and seizure of the motor can be completely prevented.

On the other hand, during the multiple J'stop I-, all of the solenoids 3f1.37 in I)11 are in the deactivated state, so the latch member 30 is
．． 31 are both separated from the one-way clutches 24 and 25. Since none of the control floats 26 and 27 are connected to the relay teeth I2'0.21 and are held in a free state M1, the original table 3 is manually reciprocated. 41 effect when opening the main body of the copying machine, processing or repairing the copying machine.

As is clear from the description in 1 below, according to the invention, 50φ
By using the following photoreceptor, the distance H between the axis of the photoreceptor and the movable member such as a rack installed on the bottom surface of the original table can be set to 80 mm.
Hereinafter, &f can be formed so that it is preferably 80 mm or less, and as a result, it is possible to downsize the drive system unit, reduce the weight by 1, and make it easier to maintain the machining accuracy of the gears that make up the drive system unit. It is possible to achieve cost reduction, etc.

Furthermore, the present invention can effectively utilize the mounting plate used for the drive system unit to easily and easily determine the positions of the photoreceptor, optical system unit, and manuscript plate, thereby improving assembly accuracy. In addition to reducing assembly man-hours, it is possible to accurately position the photoreceptor and the original table at the focal position of the exposure lens, and the image Il! 'F Mingsho direction 1- is connected.

It has various effects such as

[Brief explanation of drawings]

1 and 2 show the configuration of various parts of a copying machine according to an embodiment of the present invention, FIG. It is a sectional view taken along the line AA' in the figure. Figures 3 to 7 show the configuration of each part of the drive system 2 neatly assembled to the above embodiment, where Figure 3 is a plan view, Figure 4 is a BB' line diagram in Figure 3, and Figure 5 The figure is a view seen from the rear side of FIG. 2, and FIGS. 6 and 7 are schematic explanatory diagrams showing the states of the forward movement and return process of the document placement table.

Claims (1)

[Claims] In an image forming apparatus having a movable printing table, if the outer diameter of the photoreceptor is formed to be 50 mm or less,
The distance between the axis of the light body and the document mounting table moving member is 8.
I set it below 0mm! Image forming project featuring lG